Download the driver setup file for Broadcom Broadcom 802.11n Network Adapter driver from the link below. This is the download link for the driver version 6.35.223.5 released on 2014-11-14.

Run the driver installation file from a Windows account with the highest privileges (rights). If your User Access Control Service (UAC) is enabled then you will have to accept of the driver and run the setup with administrative rights.

Follow the driver installation wizard, which should be pretty easy to follow. The driver installation wizard will analyze your PC for compatible devices and will install the driver.

Shutdown and restart your computer and enjoy the new driver, it is as simple as that.